Back frame of flat panel display device, method for manufacturing back frame, and backlight system

ABSTRACT

The present invention provides a back frame of flat panel display device, which includes at least two primary assembling pieces. The at least two primary assembling pieces both include a joint section. The at least two primary assembling pieces are joined to form a main frame structure of the back frame by having corresponding joint sections joined to and mating each other. At least one of the primary assembling pieces includes a reinforcement structure formed on the joint section thereof. The present invention also provides a method for manufacturing a back frame and a backlight system. The back frame of flat panel display device, the method for manufacturing back frame, and the backlight system of the present invention have a simple structure and can reduce the expenditure of the back frame mold, and can also save the material used for back frame so as to lower down the cost of flat panel display device, and also improve the strength of the back frame at a joining site to thereby ensure that the overall strength of the back frame meets the desired requirements.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates to the field of displaying techniques, andin particular to a back frame of flat panel display device, a method formanufacturing back frame, and a backlight system.

2. The Related Arts

The state-of-the-art liquid crystal display device comprises a frontbezel, a panel, and a backlight module, of which the backlight modulecomprises a back frame, a reflector plate, a light guide, and a lightingassembly.

Currently, a variety of display panels of different sizes are availablein the market to meet different needs of general consumers. For example,in the field of television set, the sizes of liquid crystal panelsinclude 31.5, 42, 46, 48, and 55 inches. Different back frame molds areprovided for liquid crystal planes of different sizes.

Referring to FIG. 1, FIG. 1 is a schematic view showing a conventionalback frame of liquid crystal display device. As shown in FIG. 1, theconventional back frame 10 is a unitary back frame, and it is often thata unitary back frame 10 is made with metal stamping or plastic injectionmolding. The unitary back frame 10 consumes much material and has a highmaterial cost. Further, a large-sized back frame 10 requires large-sizedstamping equipment, and the size of mold corresponding to such a backframe 10 is large and the structure complicated, making the expenditureof the back frame mold high. As a consequence, the conventional backframe is of a high cost.

SUMMARY OF THE INVENTION

The technical issue to be addressed by the present invention is toprovide a back frame of flat panel display device, a method formanufacturing back frame, and a backlight system, which help loweringthe material cost and mold cost and also improves joint strength of theback frame.

To address the above technical issue, the present invention adopts atechnical solution that provides a back frame of flat panel displaydevice, which comprises at least two primary assembling pieces, the atleast two primary assembling pieces both comprising a joint section, theat least two primary assembling pieces being joined to form a main framestructure of the back frame by having corresponding joint sectionsjoined to and mating each other; and at least one of the primaryassembling pieces comprises a reinforcement structure formed on thejoint section thereof.

Wherein, each of the primary assembling pieces has a cross-section ofthe joint section that has a line-folded configuration in order to formthe reinforcement structure, the line-folded configuration comprising atleast two joined line segments, the reinforcement structures of the twoprimary assembling pieces being stacked in a recess-projection pairedform.

Wherein, the line-folded configuration of the reinforcement structurecomprises a rectangle, a trapezoidal, a swallow-tailed shape, a T-shape,an inverted T-shape, a conic shape, a cruciform shape, a fork-likeshape, or a grating shape.

Wherein, each of the primary assembling pieces has a cross-section ofthe joint section that is an arc shape to form the reinforcementstructure, the reinforcement structures of the two primary assemblingpieces being stacked in a recess-projection paired form.

Wherein, the arc shape of the reinforcement structure comprises one ormore groups of single curvature, dual curvatures, or multiplecurvatures.

Wherein, the at least two primary assembling pieces comprise a firstprimary assembling piece and a second primary assembling piece that arejoined to each other, wherein the first primary assembling piece has anend having a surface forming at least joint sections that are arrangedto space from each other in a lengthwise direction of the first primaryassembling piece, the first primary assembling piece using one of thejoint sections thereof to join a corresponding end of the second primaryassembling piece in order to form a main frame structure of the backframe having different sizes.

Wherein, the joint sections comprise recesses formed in a surface of thefirst primary assembling piece and having a shape corresponding to theend of the second primary assembling piece for receiving the end of thesecond primary assembling piece.

Wherein, the recess of the first primary assembling piece forms in abottom thereof a first through hole, the second primary assembling pieceforming in a corresponding location a second through hole, the backframe comprising a fastener, the fastener extending through the firstthrough hole and the second through hole to join the first primaryassembling piece and the second primary assembling piece to each other.

Wherein, the joint sections comprise recesses formed in the surface ofthe first primary assembling piece, the second primary assembling piecehaving an end having a surface forming protrusions at correspondingpositions that are arranged to space from each other in a lengthwisedirection of the second primary assembling piece, the protrusions beingreceivable in the recesses to join the first primary assembling pieceand the second primary assembling piece to each other.

Wherein, the back frame comprises a third primary assembling piece and afourth primary assembling piece; and the first primary assembling piece,the second primary assembling piece, the third primary assembling piece,and the fourth primary assembling piece are connected to each other toform a main frame structure of the back frame.

Wherein, the back frame comprises secondary assembling pieces arrangedin the main frame structure, the secondary assembling pieces beingjoined to the main frame structure.

Wherein, the secondary assembling pieces comprise a first secondaryassembling piece and a second secondary assembling piece, the firstsecondary assembling piece having two ends respectively joined to atleast two primary assembling pieces of the first primary assemblingpiece, the second primary assembling piece, the third primary assemblingpiece, and the fourth primary assembling piece, the second secondaryassembling piece having two ends respectively joined to at least twoprimary assembling pieces of the first primary assembling piece, thesecond primary assembling piece, the third primary assembling piece, andthe fourth primary assembling piece.

Wherein, the two ends of the first secondary assembling piece arerespectively joined to the first primary assembling piece and the secondprimary assembling piece that are adjacent to each other and the twoends of the second secondary assembling piece are respectively joined tothe third primary assembling piece and the fourth primary assemblingpiece that are adjacent to each other; or the two ends of the firstsecondary assembling piece are respectively joined to the first primaryassembling piece and the third primary assembling piece that areopposite to each other and the two ends of the second secondaryassembling piece are respectively joined to the first primary assemblingpiece and the third primary assembling piece that are opposite to eachother.

Wherein, the back frame comprises at least one bracing piece, which isreleasably fixed to one or more of the first primary assembling piece,the second primary assembling piece, the third primary assembling piece,the fourth primary assembling piece, the first secondary assemblingpiece, and the second secondary assembling piece, the bracing pieceforming a bump.

Wherein, the primary assembling pieces are joined by means of screwing,fastening, or welding.

To address the above technical issue, the present invention adopts atechnical solution that provides a method for making a back frame offlat panel display device, which comprises: manufacturing at least twoprimary assembling pieces, the at least two primary assembling piecesboth comprising a joint section, at least one of the joint sectionsbeing provided with a reinforcement structure claimed in any one ofClaim 1-5; and using the joint sections to join the at least two primaryassembling pieces.

Wherein, the step of manufacturing at least two primary assemblingpieces comprises: manufacturing at least first and second primaryassembling pieces, in which the first primary assembling piece has anend forming at least two joint sections, each of the joint sectionshaving a structure that mates a corresponding end of the second primaryassembling piece; and the step of using the joint sections to join theat least two primary assembling pieces comprises: selecting one jointsection of the at least two joint sections according to a size of theback frame to join the corresponding end of the second primaryassembling piece.

Wherein, when an additional joint section is present between joininglocation of the second primary assembling piece and the end of the firstprimary assembling piece, before or after the step of selecting onejoint section of the at least two joint sections according to a size ofthe back frame to join the corresponding end of the second primaryassembling piece, the additional joint section of the first primaryassembling piece that is located outward of the joining position of thesecond primary assembling piece is trimmed off.

To address the above technical issue, the present invention adopts atechnical solution that provides a backlight system, and the backlightsystem comprises a light source, a light homogenization mechanism, and aback frame; and the back frame carries the light source and the lighthomogenization mechanism, the back frame being a back frame of any oneof the previously described embodiments.

The efficacy of the present invention is that to be distinguished fromthe state of the art, the present invention provides a back frame offlat panel display device, a method for manufacturing back frame, and abacklight system that comprise a back frame formed through joiningoperations so that the back frame has a simple structure, saves thematerial used for back frame, and lowers down the manufacturing cost offlat panel display device. Through the arrangement of a reinforcementstructure on a joining site of a primary assembling piece, the strengthof the back frame at the joining site can be improved to thereby ensurethe overall strength of the back frame meets the desired requirements.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a schematic view showing a conventional back frame of liquidcrystal display device;

FIG. 2 is a schematic view showing a flat panel display device accordingto a first embodiment of the present invention;

FIG. 3 is a schematic view showing a back frame of a flat panel displaydevice according to a second embodiment of the present invention;

FIG. 4 is an enlarged view of a cross-section of a first embodiment of ajoint section of a primary assembling piece shown in FIG. 3 taken alongline A-B;

FIG. 5 is an enlarged view of a cross-section of a second embodiment ofa joint section of a primary assembling piece shown in FIG. 3 takenalong line A-B;

FIG. 6 is an enlarged view of a cross-section of a third embodiment of ajoint section of a primary assembling piece shown in FIG. 3 taken alongline A-B;

FIG. 7 is an enlarged view of a cross-section of a fourth embodiment ofa joint section of a primary assembling piece shown in FIG. 3 takenalong line A-B;

FIG. 8 is an enlarged view of a cross-section of a fifth embodiment of ajoint section of a primary assembling piece shown in FIG. 3 taken alongline A-B;

FIG. 9 is an enlarged view of a cross-section of a sixth embodiment of ajoint section of a primary assembling piece shown in FIG. 3 taken alongline A-B;

FIG. 10 is an enlarged view of a cross-section of a seventh embodimentof a joint section of a primary assembling piece shown in FIG. 3 takenalong line A-B;

FIG. 11 is an enlarged view of a cross-section of an eighth embodimentof a joint section of a primary assembling piece shown in FIG. 3 takenalong line A-B;

FIG. 12 is an enlarged view of a cross-section of a ninth embodiment ofa joint section of a primary assembling piece shown in FIG. 3 takenalong line A-B;

FIG. 13 is an enlarged view of a cross-section of a tenth embodiment ofa joint section of a primary assembling piece shown in FIG. 3 takenalong line A-B;

FIG. 14 is a schematic view showing another structure of thereinforcement structure of the back frame shown in FIG. 3;

FIG. 15 is a schematic view showing a back frame of a flat panel displaydevice according to a third embodiment of the present invention;

FIG. 16 is a schematic view showing a back frame of a flat panel displaydevice according to a fourth embodiment of the present invention;

FIG. 17 is a schematic view showing a joining structure of a flat paneldisplay device according to a fifth embodiment of the present invention;

FIG. 18 is a schematic view showing a diagonally-arranged firstsecondary assembling piece mounted to a main frame structure of a flatpanel display device according to a sixth embodiment of the presentinvention;

FIG. 19 is a schematic view showing a first secondary assembling pieceand a second secondary assembling piece mounted to a main framestructure of a flat panel display device according to a seventhembodiment of the present invention;

FIG. 20 is a schematic view showing joint sections of a back frame of aflat panel display device according to an eighth embodiment of thepresent invention;

FIG. 21 is a cross-sectional view showing a first example of jointsection of FIG. 20;

FIG. 22 is a schematic view showing a joining structure of a jointsection of a back frame of a flat panel display device according to aninth embodiment of the present invention;

FIG. 23 is a schematic view showing a joining structure of a jointsection of a back frame of a flat panel display device according to atenth embodiment of the present invention;

FIG. 24 is a schematic view showing a joining structure of a jointsection of a back frame of a flat panel display device according to aneleventh embodiment of the present invention;

FIG. 25 is a schematic view showing a joint section of a back frame of aflat panel display device according to a twelfth embodiment of thepresent invention;

FIG. 26 is a schematic view showing a joint section of a back frame of aflat panel display device according to a thirteenth embodiment of thepresent invention;

FIG. 27 is a flow chart showing a method for manufacturing a back frameof a flat panel display device according to a fourteenth embodiment ofthe present invention;

FIG. 28 is a schematic view showing a flat panel display device with atouch screen according to a fifteenth embodiment of the presentinvention;

FIG. 29 is a schematic view showing a stereoscopic display deviceaccording to a sixteenth embodiment of the present invention; and

FIG. 30 is a schematic view showing a plasma display device according toa seventeenth embodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

Referring to FIGS. 2-3, FIG. 2 is a schematic view showing a flat paneldisplay device according to a first embodiment of the present inventionand FIG. 3 is a schematic view showing a first embodiment of a backframe of a flat panel display device according to a second embodiment ofthe present invention. As shown in FIG. 2, the flat panel display device20 according to the instant embodiment comprises: a backlight system 21and a display panel 22. The backlight system 21 is arranged on a backside of the display panel 22 and supplies light to the display panel 22.

In the instant embodiment, the backlight system 21 comprises a lightsource 25, a light homogenization mechanism 24, and a back frame 23. Theback frame 23 carries the light source 25 and the light homogenizationmechanism 24. When the backlight system 21 is an edge lighting type, thelight homogenization mechanism 24 is a light guide; and when thebacklight system 21 is a direct type, the light homogenization mechanism24 is a diffuser plate. The back frame 23 comprises at least a firstprimary assembling piece and a second primary assembling piece, and thetwo of at least a first and second primary assembling pieces constitutea main frame structure 27 of the back frame 23.

Referring also to FIG. 3, the back frame 23 of the first embodimentcomprises a first primary assembling piece 261 and a second primaryassembling piece 262. The first primary assembling piece 261 has an endjoined to an end of the second primary assembling piece 262, and thefirst primary assembling piece 261 has another end joined to another endof the second primary assembling piece 262 in order to form the mainframe structure 27 of the back frame 23. The first primary assemblingpiece 261 and the second primary assembling piece 262 are both aluminumpieces or galvanized steel pieces. In the instant embodiment, the firstprimary assembling piece 261 and the second primary assembling piece 262are L-shaped.

Further referring to FIG. 3, in the instant embodiment, the firstprimary assembling piece 261 comprises a joint section 2611 and thesecond primary assembling piece 262 comprises a joint section 2612. Atleast one of the first primary assembling piece 261 and the secondprimary assembling piece 262 comprises a reinforcement structure on thejoint section thereof. In other words, the reinforcement structure isarranged on at least the joint section 2611 or the joint section 2612.

An example that the joint section 2611 and the joint section 2612 areboth provided with a reinforcement structure will be described.

The joint section 2611 and the joint section 2612 have a cross-sectionthat has a line-folded configuration in order to form a reinforcementstructure. The line-folded configuration comprises at least two joinedline segments. For example, the line-folded configuration of thereinforcement structure may be a rectangle (as shown in FIG. 4), atrapezoidal (as shown in FIG. 5), a swallow-tailed shape (as shown inFIG. 6), an inverted T-shape (as shown in FIG. 7), a conic shape (asshown in FIG. 8), a wavy shape (as shown in FIG. 9), a grating shape (asshown in FIG. 10), or may alternatively be a T-shape, a cruciform shape,or a fork-like shape. The reinforcement structure of the joint section2611 of the first primary assembling piece 261 and the reinforcementstructure of the joint section 2621 of the second primary assemblingpiece 262 are stacked in a recess-projection paired form.

Alternatively, the joint section 2611 and the joint section 2621 mayhave a cross-section that is an arc shape to form the reinforcementstructure. When the cross-section is an arc shape, the arc shape can beone or more groups of single curvature (as shown in FIG. 11), dualcurvatures (as shown in FIG. 12) or multiple curvatures (as shown inFIG. 13). The reinforcement structure of the joint section 2611 of thefirst primary assembling piece 261 and the reinforcement structure ofthe joint section 2621 of the second primary assembling piece 262 arestacked in a recess-projection paired form.

It is apparent that the shape of the cross-section that can be used toform a reinforcement structure is not limited to these and any can beused provided the strength of the reinforcement structure is improved.Further, it is noted that in all the embodiments of joint section ofprimary assembling piece shown in FIGS. 4-13, except FIG. 4 showing theshapes of the reinforcement structure of the joint section 2611 and thereinforcement structure of the joint section 2621 and therecess-projection stacking between the two reinforcement structures, forsimplification purposes, the remaining drawings show only the shape ofthe reinforcement structure of one of the joint section 2611 or 2612 andthe recess-projection stacking is not illustrated.

Referring to FIG. 14, which is a schematic view showing anotherstructure of the reinforcement structure provided on the joint section2621, the reinforcement structure comprises a plate layer 2623. Theplate layer 2623 functions to thicken the joint section 2621, with thejoint section 2611 being stacked on the joint section 2621.

It is appreciated that the embodiments of the present invention employ ajoining operation to form a back frame in order to simplify thestructure of the back frame and save the material used for the backframe so as to reduce the manufacturing cost of a backlight displaydevice. Meanwhile, through the arrangement of reinforcement structure ona joint section of a primary assembling piece, the strength of the jointsite of the back frame can be improved to thereby ensure the overallstrength of the back frame meets desired requirement.

It is noted all the embodiments of the reinforcement structure describedabove are also applicable to various embodiments of back frame,backlight system, and flat panel display device.

Referring also to FIG. 15, the back frame 23 of a third embodimentcomprises a first primary assembling piece 281, a second primaryassembling piece 282, and a third primary assembling piece 283. Thethree primary assembling pieces 281, 282, and 283 are assembled andjoined to form a main frame structure 27 of the back frame 23. The threeprimary assembling pieces 281, 282, and 283 are all aluminum pieces orgalvanized steel pieces. An end of the first primary assembling piece281 is joined to an end of the second primary assembling piece 282.Another end of the primary assembling piece 282 is joined to an end ofthe third primary assembling piece 283. Another end of the third primaryassembling piece 282 is joined to another end of the first primaryassembling piece 281.

In the instant embodiment, the first primary assembling piece 281 isL-shaped, and the second and third primary assembling pieces 282, 283are straight linear.

Further, the back frame 23 further comprises secondary assembling piecesarranged inside and joined to the main frame structure 27.

A detailed description will be given to the back frame 23 of the flatpanel display device 20 according to the present invention, whichcomprises four primary assembling pieces and two secondary assemblingpieces.

Referring to FIG. 16, FIG. 16 is a schematic view showing a back frameof flat panel display device according to a fourth embodiment of thepresent invention. As shown in FIG. 16, in the instant embodiment, aback frame 23 comprises: a first primary assembling piece 231, a secondprimary assembling piece 232, a third primary assembling piece 233, afourth primary assembling piece 234, a first secondary assembling piece235, a second secondary assembling piece 236, and bracing pieces 2371,2372, 2373, 2374, 2375, 2376, and 2377. The first primary assemblingpiece 231, the second primary assembling piece 232, the third primaryassembling piece 233, and the fourth primary assembling piece 234 arejoined to each other in a leading end-to-tailing end manner toconstitute a rectangular main frame structure 27 of the back frame 23.The first secondary assembling piece 235 and the second secondaryassembling piece 236, serving as ancillary assembling pieces, arearranged in the main frame structure 27 and joined to the main framestructure 27.

Specifically, an end of the first primary assembling piece 231 is joinedto an end of the second primary assembling piece 232, another end of thesecond primary assembling piece 232 is joined to an end of the thirdprimary assembling piece 233, another end of the third primaryassembling piece 233 is joined to an end of the fourth primaryassembling piece 234, and another end of the fourth primary assemblingpiece 234 is joined to another end of the first primary assembling piece231 in order to form the rectangular main frame structure 27. The firstprimary assembling piece 231, the second primary assembling piece 232,the third primary assembling piece 233, and the fourth primaryassembling piece 234 are all aluminum pieces or galvanized steel pieces.In the instant embodiment, the first primary assembling piece 231, thesecond primary assembling piece 232, the third primary assembling piece233, and the fourth primary assembling piece 234 are straight linear,yet in other embodiments, it is apparent to those skilled in the art tomake all the first primary assembling piece 231, the second primaryassembling piece 232, the third primary assembling piece 233, and thefourth primary assembling piece 234 L-shaped, or some being straightlinear and the remaining being L-shaped. For example, in FIG. 3, thefirst primary assembling piece 261 and the second primary assemblingpiece 262 are both L-shaped; in FIG. 15, the first primary assemblingpiece 281 is L-shaped, while the second and third primary assemblingpieces 282 and 283 are straight linear.

Referring to FIG. 17, FIG. 17 is a schematic view showing a joiningstructure of a flat panel display device according to a fifth embodimentof the present invention. In the instant embodiment, the back frame 23of the flat panel display device 20 is formed by joining connection. Asshown in FIG. 17, an illustrative example is given for the connection ofan end of the first primary assembling piece 231 to an end of the secondprimary assembling piece 232, wherein the end of the second primaryassembling piece 232 is joined to the end of the first primaryassembling piece 231 by means of for example screwing, fastening, orwelding, to have the end of the second primary assembling piece 232connected to the end of the first primary assembling piece 231.

Referring to FIG. 18, FIG. 18 is a schematic view showing adiagonally-arranged first secondary assembling piece mounted to a mainframe structure of a flat panel display device according to a sixthembodiment of the present invention. In the instant embodiment, thefirst secondary assembling piece 235 and the second secondary assemblingpiece 236 are arranged in the main frame structure 27 of the back frame23. An end of the first secondary assembling piece 235 is joined to thefirst primary assembling piece 231 and another end of the firstsecondary assembling piece 235 is joined to the third primary assemblingpiece 233; and an end of the second secondary assembling piece 236 isjoined to the first primary assembling piece 231 and another end of thesecond secondary assembling piece 236 is joined to the third primaryassembling piece 233. Further, the second primary assembling piece 232,the fourth primary assembling piece 234, the first secondary assemblingpiece 235, and the second secondary assembling piece 236 are arrangedparallel to each other. In other embodiments, those skilled in the artmay arrange at least one secondary assembling piece in the main framestructure 27. For example, only the first secondary assembling piece 235is arranged in the main frame structure 27. Further, the two ends of thefirst secondary assembling piece 235 can be selectively joined to atleast two of the primary assembling pieces of the first primaryassembling piece 231, the second primary assembling piece 232, the thirdprimary assembling piece 233, and the fourth primary assembling piece234. For example, the first secondary assembling piece 235 is setdiagonally in the main frame structure 27, as shown in FIG. 18.Similarly, the two ends of the second secondary assembling piece 236 canbe selectively joined to at least two of the primary assembling piecesof the first primary assembling piece 231, the second primary assemblingpiece 232, the third primary assembling piece 233, and the fourthprimary assembling piece 234.

Referring to FIG. 19, FIG. 19 is a schematic view showing a firstsecondary assembling piece and a second secondary assembling piecemounted to a main frame structure of a flat panel display deviceaccording to a seventh embodiment of the present invention. For example,the two ends of the first secondary assembling piece 235 arerespectively joined to the first primary assembling piece 231 and thesecond primary assembling piece 232 that are adjacent to each other andthe two ends of the second secondary assembling piece 236 arerespectively joined the third primary assembling piece 233 and thefourth primary assembling piece 234 that are adjacent to each other.

Collectively referring to FIGS. 15-19, in the above embodiments, theback frame 23 comprises seven bracing pieces 2371, 2372, 2373, 2374,2375, 2376, and 2377. The bracing piece 2371 is fixed to the fourthprimary assembling piece 234; the bracing pieces 2372, 2373 are bothfixed to the first secondary assembling piece 235; the bracing piece2374 is fixed to the second secondary assembling piece 236; the bracingpiece 2375 is fixed to the second primary assembling piece 232; and thebracing pieces 2376, 2377 are each fixed, at two ends thereof, to thefirst secondary assembling piece 235 and the second secondary assemblingpiece 236. In practice, the bracing pieces can be fixed to one or moreof the first primary assembling piece 231, the second primary assemblingpiece 232, the third primary assembling piece 233, the fourth primaryassembling piece 234, the first secondary assembling piece 235, and thesecond secondary assembling piece 236. In other embodiments, thoseskilled in the art may mount bracing pieces of any other numbers to theback frame 23, such as one or more bracing pieces. Further, the bracingpieces can be releasably fixed to one or more of the first primaryassembling piece 231, the second primary assembling piece 232, the thirdprimary assembling piece 233, the fourth primary assembling piece 234,the first secondary assembling piece 235, and the second secondaryassembling piece 236.

The bracing pieces 2371, 2372, 2373, 2374, 2375, 2376, and 2377 may beprovided with bumps (not labeled) so that the back frame 23 may fixcomponents, such as circuit boards, with such bumps.

Molds for making the back frame 23 will be described. In the instantembodiment, the first primary assembling piece 231 and the third primaryassembling piece 233 are of the same size and shape so that they can bemade by stamping with the same mold. The second primary assembling piece232, the fourth primary assembling piece 234, the first secondaryassembling piece 235, and the second secondary assembling piece 236 areof the same size and shape so that they can be made by stamping with thesame mold, making it possible to share the mold. Thus, the back frame 23of the present invention can be made by stamping with only twosmall-sized molds, and compared to the conventional back frame 10 thatrequires a large-sized mold, the molds for making the back frame 23 ofthe present invention are simple in structure and small in size and thusthe cost of mold for the back frame 23 can be lowered. Further, comparedto the whole back frame structure of the conventional back frame 10, theback frame 23 of the present invention can significantly save materialused and thus reduce the manufacturing cost of the flat panel displaydevice 20.

Referring to FIG. 20, FIG. 20 is a schematic view showing joint sectionsof a back frame of a flat panel display device according to an eighthembodiment of the present invention. As shown in FIG. 20, in the instantembodiment, an end of the first primary assembling piece is providedwith two joint sections, and the joint sections have a structure matingan end of the second primary assembling piece so that the first primaryassembling piece can be joined to a corresponding end of the secondprimary assembling piece.

Specifically, the first primary assembling piece 231 has an end having asurface forming joint sections 2311, 2312, and the joint sections 2311,2312 are arranged in a spaced manner in a lengthwise direction of thefirst primary assembling piece 231. The joint sections 2311, 2312 areformed by forming recesses having a shape mating an end of the secondprimary assembling piece 232 in the first primary assembling piece 231in order to receive the end of the second primary assembling piece 232therein.

Referring to FIG. 21, FIG. 21 is a cross-sectional view showing a firstexample of joint section of FIG. 20. As shown in FIG. 21, the jointsections 2311, 2312 are recesses that do not extend through oppositesurfaces of the end of the first primary assembling piece 231 and therecesses are of a rectangular shape with the second primary assemblingpiece 232 being straight linear.

To assemble a large-sized back frame 23, the joint section 2311 that isclose to the very end of the first primary assembling piece 231 is firsttaken and a second primary assembling piece 232 having a correspondingwidth is selected. Afterwards, an end of the second primary assemblingpiece 232 is positioned in the recess of the joint section 2311. Andthen, means, such as screwing, fastening, or welding, is applied to joinand fix the end of the second primary assembling piece 232 to the jointsection 2311. To assemble a small-sized back frame 23, the joint section2312 that is distant from the very end of the first primary assemblingpiece 231 is first chosen and a second primary assembling piece 232having a corresponding width is selected. Afterwards, an end of thesecond primary assembling piece 232 is positioned in the recess of thejoint section 2312. And then, means, such as screwing, fastening, orwelding, is applied to join and fix the end of the second primaryassembling piece 232 to the joint section 2312.

Referring to FIG. 11, FIG. 11 is a schematic view showing a joiningstructure of a joint section of a back frame of a flat panel displaydevice according to a ninth embodiment of the present invention. Asshown in FIG. 22, to allow of selection of the size of the back frame 23in another direction, for example the second primary assembling piece232 forms a protrusion at a corresponding location on a surface thereof,and the protrusion of the second primary assembling piece 232 isembedded in the recess the first primary assembling piece 231 at acorresponding location in order to join the first primary assemblingpiece 231 and the second primary assembling piece 232. Further, thesecond primary assembling piece 232 may form, on a surface of one endthereof, at least two protrusions that are spaced in the lengthwisedirection of the second primary assembling piece 232, such as two,three, or four protrusions.

Furthermore, as shown in FIG. 23, FIG. 23 is a schematic view showing ajoining structure of a joint section of a back frame of a flat paneldisplay device according to a tenth embodiment of the present invention.The recess of the first primary assembling piece 231 can be a recess ofa multi-stepped configuration and the second primary assembling piece232 forms, at a corresponding location, a protrusion having amulti-stepped configuration corresponding to the recess.

Further, as shown in FIG. 24, FIG. 24 is a schematic view showing ajoining structure of a joint section of a back frame of a flat paneldisplay device according to an eleventh embodiment of the presentinvention. Taking the joint section 2311 as an example, the recess ofthe first primary assembling piece 231 forms, in a bottom thereof, afirst through hole 2313, and the second primary assembling piece 232forms, at a location corresponding to the joint section 2311, a secondthrough hole 2321. The back frame 23 further comprises a fastener 240.The fastener 240 extends through the first through hole 2313 and thesecond through hole 2321 to joint the first primary assembling piece 231and the second primary assembling piece 232 to each other.

As shown in FIG. 25, FIG. 25 is a schematic view showing a joint sectionof a back frame of a flat panel display device according to a twelfthembodiment of the present invention. The recesses of the joint sections2311, 2312 of the first primary assembling piece 231 are of a circularshape. Yet, in other embodiments, those skilled in the art may arrangethe shape of the recesses to be other polygonal configurations, such astriangle.

As shown in FIG. 26, FIG. 26 is a schematic view showing a joint sectionof a back frame of a flat panel display device according to a thirteenthembodiment of the present invention. In another embodiment of the backframe of flat panel display device according to the present invention,the joint sections 2311, 2312 are recesses that do not extend throughopposite surfaces of the first primary assembling piece 231, whereby anend of the second primary assembling piece 232 is movable within thejoint sections 2311, 2312. For example, after the end of the secondprimary assembling piece 232 is set extending beyond and joined andfixed to the joint section 2312, the portion of extension is thentrimmed off so that the length of the second primary assembling piece232 that serves as a primary assembling piece of the back frame can beadjusted and thus back frames of different sizes can be obtained.

In a practical application, the other end of the first primaryassembling piece 231 and both ends of the third primary assembling piece233 are all provided with two joint sections having a structureidentical to that of the joint sections 2311, 2312. The ends of thesecond primary assembling piece 232 and the ends of the fourth primaryassembling piece 234 may be subjected to specific designs or no designat all according to different applications. For example:

(1) In a first situation, as shown in FIG. 21, the two ends of thesecond primary assembling piece 232 and the two ends of the fourthprimary assembling piece 234 are of no specific design. In other words,the ends are of the same structure as the remaining portions. Under thiscondition, in making a join with a selected joint section 2311 (2312) atone end of the first primary assembling piece 231 (the same applicableto the other end), if an attempt is made to change the width of the backframe 23, then the length of the corresponding second primary assemblingpiece 232 and fourth primary assembling piece 234 must be selectedaccordingly. Namely, if the joint section 2311 that is close to the veryend of the first primary assembling piece 231 is selected for joining,then no trimming is applied to the second primary assembling piece 232and the fourth primary assembling piece 234 or the portion that istrimmed off is short; if the joint section 2312 that is distant from thevery end of the first primary assembling piece 231 is selected forjoining, then the second primary assembling piece 232 and the fourthprimary assembling piece 234 are trimmed and the trimmed portion beinglong or short is according to the distance that the joint section isfrom the very end of the first primary assembling piece 231 being greator small; and

(2) In a second situation, it is similar to the first situation, but asshown in FIG. 22, the second primary assembling piece 232 and the fourthprimary assembling piece 234 use different protrusions to respectivelymate the first primary assembling piece 231 and the third primaryassembling piece 233 in order to realize change of width of the backframe 23; similarly, if a joint section 2312 other than the first jointsection 2311 that is close to the very end of the first primaryassembling piece 231 is selected for joining, then before or afterjoining, excessive portions of the second primary assembling piece 232and the fourth primary assembling piece 234 may be trimmed off.

This also applicable to an embodiment of the main frame structure 27 ofthe back frame 23 that is formed by only joining two L-shaped primaryassembling pieces.

In summary, the present invention provides a back frame 23 having afirst primary assembling piece that is provided with at least two jointsections. The number of the joint section can be selected according tothe requirement of customers. In the instant embodiment, a descriptionis given to an example comprising two joint sections 2311, 2312. Thus,to prepare the molds for making the back frame 23, only two sets of moldare needed, namely one mold for a first primary assembling piece and theother mold for a second primary assembling piece. The first primaryassembling piece may be provided with a plurality of joint sections forjoining operation in order to form various sizes for the back frame 23.To assemble the back frame 23, based on the desired size of the backframe 23, the corresponding one of the joint sections is selected. Withthe joint section, the second primary assembling piece is joined to thejoint section of the first primary assembling piece and the other jointsection of the first primary assembling piece that is located outward ofthe joining location of the second primary assembling piece is trimmedoff to obtain a desired size of the back frame 23. Compared to theconventional technology that requires different back frame molds formaking different sizes of back frame 10, the back frame of the flatpanel display device 23 according to the present invention requires onlya mold for the first primary assembling piece and a mold for the secondprimary assembling piece 28 so that mold sharing among various sizes ofproduct can be realized and the molds used are of simple structures,allowing of reduction of expenditure of the molds for back frames.

The present invention also provides a mold for making a back frame offlat panel display device. The back frame mold is provided with a mainpattern for forming a primary assembling piece of the back frame and themain pattern comprises a sub-pattern that forms at least two jointsections on an end of the primary assembling piece. The primaryassembling piece comprises the previously discussed first primaryassembling piece and second primary assembling piece, corresponding tothe above mentioned main pattern; and the joint section comprises thepreviously discussed joint section of the first primary assemblingpiece, corresponding to the above mentioned sub-pattern. Repeateddescription is omitted herein.

The present invention also provides a method for making a back frame offlat panel display device. As shown in FIG. 27, FIG. 27 is a flow chartshowing a method for manufacturing a back frame of a flat panel displaydevice according to a fourteenth embodiment of the present invention.The method comprises the following steps:

Step 501: manufacturing at least first and second primary assemblingpieces, wherein the first primary assembling piece has an end forming atleast two joint sections, in which at least one joint section isprovided with a reinforcement structure of any of the previouslydiscussed embodiments, each of the joint sections having a structurethat mates a corresponding end of the second primary assembling piece;and

Step 502: selecting one joint section of the at least two joint sectionsaccording to a size of the back frame to join the corresponding end ofthe second primary assembling piece and using the joint section to jointhe at least first and second primary assembling pieces.

In the instant embodiment, when other joint sections are present betweenthe joining location of the second primary assembling piece and the endof the first primary assembling piece, before or after the step ofselecting one joint section of the at least two joint sections accordingto a size of the back frame to join the corresponding end of the secondprimary assembling piece, the other joint sections of the first primaryassembling piece that are located outward of the joining position of thesecond primary assembling piece are trimmed off. The first primaryassembling piece comprises the previously discussed first primaryassembling piece, and the second primary assembling piece comprises thepreviously discussed second primary assembling piece, and repeateddescription will be omitted herein.

As shown in FIG. 28, FIG. 28 is a schematic view showing a flat paneldisplay device with a touch screen according to a fifteenth embodimentof the present invention. The flat panel display device 20 of thepresent invention further comprises a touch screen 29. The touch screen29 is arranged on a light exit surface of the display panel 22 of theflat panel display device 20. The flat panel display device 20comprises: the backlight system 21 and the above discussed display panel22. The backlight system 21 is arranged at the back side of the displaypanel 22 and supplies light to the display panel 22.

The backlight system 21 comprises a light source 25, a lighthomogenization mechanism 24, and a back frame 23. The back frame 23carries the light source 25 and the light homogenization mechanism 24.When the backlight system 21 is an edge lighting type, the lighthomogenization mechanism 24 is a light guide; and when the backlightsystem 21 is a direct type, the light homogenization mechanism 24 is adiffuser plate. The back frame 23 comprises at least a first primaryassembling piece and a second primary assembling piece, and the at leastone first and second primary assembling pieces constitute a main framestructure 27 of the back frame 23.

It is noted that the flat panel display device 20 of the presentinvention can be a liquid crystal display device or a liquid crystaltelevision.

The present invention also provides a stereoscopic display device 30, asshown in FIG. 29. FIG. 29 is a schematic view showing a stereoscopicdisplay device according to a sixteenth embodiment of the presentinvention. The stereoscopic display device 30 comprises a liquid crystallens grating 31, a backlight system 32, and a display panel 33. Theliquid crystal lens grating 31 is arranged on a light exit surface ofthe display panel 33. The backlight system 32 can be a backlight systemof any one of the above discussed embodiments, such as the backlightsystem 32 comprising the back frame 23. The back frame 23 comprises atleast first primary assembling piece and the second primary assemblingpiece. The at least first and second primary assembling pieces form amain frame structure of the back frame. Repeated description will beomitted herein.

The present invention also provides a plasma display device 40, as shownin FIG. 30. FIG. 30 is a schematic view showing a plasma display deviceaccording to a seventeenth embodiment of the present invention. Theplasma display device 40 comprises a plasma display panel 41 and a backframe 42. The back frame 42 is arranged at a back side of the displaypanel 41. The back frame 42 can be the back frame of any one of thepreviously discussed embodiments and repeated description will beomitted herein.

With the above discussed manners, the present invention provides a flatpanel display device, a stereoscopic display device, and a plasmadisplay device that have a mold for back frame that is of a simplestructure, reduce the cost of back frame mold, and save the materialused for the back frame, so as to lower down the cost of flat paneldisplay device. Through the arrangement of a reinforcement structure ona joining site of a primary assembling piece, the strength of the backframe at the joining site can be improved to thereby ensure the overallstrength of the back frame.

Embodiments of the present invention have been described, but are notintending to impose any undue constraint to the appended claims of thepresent invention. Any modification of equivalent structure orequivalent process made according to the disclosure and drawings of thepresent invention, or any application thereof, directly or indirectly,to other related fields of technique, is considered encompassed in thescope of protection defined by the clams of the present invention.

What is claimed is:
 1. A back frame of a flat panel display device,wherein: the back frame comprises at least two primary assemblingpieces, the at least two primary assembling pieces both comprising ajoint section, the at least two primary assembling pieces being joinedto form a main frame structure of the back frame by having correspondingjoint sections joined to and mating each other; and at least one of theprimary assembling pieces comprises a reinforcement structure formed onthe joint section thereof; wherein each of the primary assembling pieceshas a cross-section of the joint section that has a line-foldedconfiguration in order to form the reinforcement structure, theline-folded configuration comprising at least two joined line segmentsand forming a grating shape that comprises an array of cells comprisinga plurality of rows of cells in a first direction and a plurality ofcolumns of cells in a second direction that is substantiallyperpendicular to the first direction, the reinforcement structures ofthe two primary assembling pieces being stacked in a recess-projectionpaired form; wherein the at least two primary assembling pieces comprisea first primary assembling piece and a second primary assembling piecethat are joined to each other, wherein the first primary assemblingpiece has an end having a surface forming at least two joint sectionsthat are arranged to space from each other in a lengthwise direction ofthe first primary assembling piece, the first primary assembling pieceusing one of the joint sections thereof to join a corresponding end ofthe second primary assembling piece in order to form a main framestructure of the back frame having different sizes; wherein differentjoint sections will be used for the back frame having different sizes.2. The back frame as claimed in claim 1, wherein: the joint sectionscomprise recesses formed in a surface of the first primary assemblingpiece and having a shape corresponding to the end of the second primaryassembling piece for receiving the end of the second primary assemblingpiece.
 3. The back frame as claimed in claim 2, wherein: the recess ofthe first primary assembling piece forms in a bottom thereof a firstthrough hole, the second primary assembling piece forming in acorresponding location a second through hole, the back frame comprisinga fastener, the fastener extending through the first through hole andthe second through hole to join the first primary assembling piece andthe second primary assembling piece to each other.
 4. The back frame asclaimed in claim 1, wherein: the joint sections comprise recesses formedin the surface of the first primary assembling piece, the second primaryassembling piece having an end having a surface forming protrusions atcorresponding positions that are arranged to space from each other in alengthwise direction of the second primary assembling piece, theprotrusions being receivable in the recesses to join the first primaryassembling piece and the second primary assembling piece to each other.5. The back frame as claimed in claim 1, wherein: the back framecomprises a third primary assembling piece and a fourth primaryassembling piece; and the first primary assembling piece, the secondprimary assembling piece, the third primary assembling piece, and thefourth primary assembling piece are connected to each other to form amain frame structure of the back frame.
 6. The back frame as claimed inclaim 5, wherein: the back frame comprises secondary assembling piecesarranged in the main frame structure, the secondary assembling piecesbeing joined to the main frame structure.
 7. The back frame as claimedin claim 6, wherein: the secondary assembling pieces comprise a firstsecondary assembling piece and a second secondary assembling piece, thefirst secondary assembling piece having two ends respectively joined toat least two primary assembling pieces of the first primary assemblingpiece, the second primary assembling piece, the third primary assemblingpiece, and the fourth primary assembling piece, the second secondaryassembling piece having two ends respectively joined to at least twoprimary assembling pieces of the first primary assembling piece, thesecond primary assembling piece, the third primary assembling piece, andthe fourth primary assembling piece.
 8. The back frame as claimed inclaim 7, wherein: the two ends of the first secondary assembling pieceare respectively joined to the first primary assembling piece and thesecond primary assembling piece that are adjacent to each other and thetwo ends of the second secondary assembling piece are respectivelyjoined to the third primary assembling piece and the fourth primaryassembling piece that are adjacent to each other; or the two ends of thefirst secondary assembling piece are respectively joined to the firstprimary assembling piece and the third primary assembling piece that areopposite to each other and the two ends of the second secondaryassembling piece are respectively joined to the first primary assemblingpiece and the third primary assembling piece that are opposite to eachother.
 9. The back frame as claimed in claim 7, wherein: the back framecomprises at least one bracing piece, which is releasably fixed to oneor more of the first primary assembling piece, the second primaryassembling piece, the third primary assembling piece, the fourth primaryassembling piece, the first secondary assembling piece, and the secondsecondary assembling piece, the bracing piece forming a bump.
 10. Theback frame as claimed in claim 1, wherein: the primary assembling piecesare joined by means of screwing, fastening, or welding.
 11. A method formaking a back frame of a flat panel display device, wherein:manufacturing at least two primary assembling pieces, the at least twoprimary assembling pieces both comprising a joint section, at least oneof the joint sections being provided with a reinforcement structureclaimed in claim 1; and using the joint sections to join the at leasttwo primary assembling pieces.
 12. The method as claimed in claim 11,wherein: the step of manufacturing at least two primary assemblingpieces comprises: manufacturing at least first and second primaryassembling pieces, in which the first primary assembling piece has anend forming at least two joint sections, each of the joint sectionshaving a structure that mates a corresponding end of the second primaryassembling piece; and the step of using the joint sections to join theat least two primary assembling pieces comprises: selecting one jointsection of the at least two joint sections according to a size of theback frame to join the corresponding end of the second primaryassembling piece.
 13. The method as claimed in claim 12, wherein when anadditional joint section is present between joining location of thesecond primary assembling piece and the end of the first primaryassembling piece, before or after the step of selecting one jointsection of the at least two joint sections according to a size of theback frame to join the corresponding end of the second primaryassembling piece, the additional joint section of the first primaryassembling piece that is located outward of the joining position of thesecond primary assembling piece is trimmed off.
 14. A backlight system,wherein: the backlight system comprises a light source, a lighthomogenization mechanism, and a back frame; and the back frame carriesthe light source and the light homogenization mechanism, the back framebeing a back frame claimed in claim 1.